private static void EmitNumericConversion(ILGenerator il, Type typeFrom, Type typeTo, bool isChecked)
{
if (
!(typeFrom.IsEnum || TypeUtil.IsNumeric(typeFrom)) ||
!(typeTo.IsEnum || TypeUtil.IsNumeric(typeTo))
)
{
throw new InvalidOperationException("Unhandled convert");
}
bool isFromUnsigned = TypeUtil.IsUnsigned(typeFrom);
bool isFromFloatingPoint = TypeUtil.IsFloatingPoint(typeFrom);
if (typeTo == typeof(Single))
{
if (isFromUnsigned)
{
il.Emit(OpCodes.Conv_R_Un);
}
il.Emit(OpCodes.Conv_R4);
}
else if (typeTo == typeof(Double))
{
if (isFromUnsigned)
{
il.Emit(OpCodes.Conv_R_Un);
}
il.Emit(OpCodes.Conv_R8);
}
else
{
TypeCode tc = Type.GetTypeCode(typeTo);
if (isChecked)
{
// Overflow checking needs to know if the source value on the IL stack is unsigned or not.
if (isFromUnsigned)
{
switch (tc)
{
case TypeCode.SByte:
il.Emit(OpCodes.Conv_Ovf_I1_Un);
break;
case TypeCode.Int16:
il.Emit(OpCodes.Conv_Ovf_I2_Un);
break;
case TypeCode.Int32:
il.Emit(OpCodes.Conv_Ovf_I4_Un);
break;
case TypeCode.Int64:
il.Emit(OpCodes.Conv_Ovf_I8_Un);
break;
case TypeCode.Byte:
il.Emit(OpCodes.Conv_Ovf_U1_Un);
break;
case TypeCode.UInt16:
case TypeCode.Char:
il.Emit(OpCodes.Conv_Ovf_U2_Un);
break;
case TypeCode.UInt32:
il.Emit(OpCodes.Conv_Ovf_U4_Un);
break;
case TypeCode.UInt64:
il.Emit(OpCodes.Conv_Ovf_U8_Un);
break;
default:
throw new InvalidOperationException("Unhandled convert");
}
}
else
{
switch (tc)
{
case TypeCode.SByte:
il.Emit(OpCodes.Conv_Ovf_I1);
break;
case TypeCode.Int16:
il.Emit(OpCodes.Conv_Ovf_I2);
break;
case TypeCode.Int32:
il.Emit(OpCodes.Conv_Ovf_I4);
break;
case TypeCode.Int64:
il.Emit(OpCodes.Conv_Ovf_I8);
break;
case TypeCode.Byte:
il.Emit(OpCodes.Conv_Ovf_U1);
break;
case TypeCode.UInt16:
case TypeCode.Char:
il.Emit(OpCodes.Conv_Ovf_U2);
break;
case TypeCode.UInt32:
il.Emit(OpCodes.Conv_Ovf_U4);
break;
case TypeCode.UInt64:
il.Emit(OpCodes.Conv_Ovf_U8);
break;
default:
throw new InvalidOperationException("Unhandled convert");
}
}
}
else
{
switch (tc)
{
case TypeCode.SByte:
il.Emit(OpCodes.Conv_I1);
break;
case TypeCode.Byte:
il.Emit(OpCodes.Conv_U1);
break;
case TypeCode.Int16:
il.Emit(OpCodes.Conv_I2);
break;
case TypeCode.UInt16:
case TypeCode.Char:
il.Emit(OpCodes.Conv_U2);
break;
case TypeCode.Int32:
il.Emit(OpCodes.Conv_I4);
break;
case TypeCode.UInt32:
il.Emit(OpCodes.Conv_U4);
break;
case TypeCode.Int64:
if (isFromUnsigned)
{
il.Emit(OpCodes.Conv_U8);
}
else
{
il.Emit(OpCodes.Conv_I8);
}
break;
case TypeCode.UInt64:
if (isFromUnsigned || isFromFloatingPoint)
{
il.Emit(OpCodes.Conv_U8);
}
else
{
il.Emit(OpCodes.Conv_I8);
}
break;
default:
throw new InvalidOperationException("Unhandled convert");
}
}
}
}
public void MethodCall(MethodCall methodCall)
{
bool isStatic = methodCall.Operand is TypeAccess;
if (!isStatic)
{
bool emitBox = false;
bool emitStoreLoad = false;
if (
(methodCall.Operand is FieldAccess || methodCall.Operand is Constant) &&
methodCall.Operand.Type.IsValueType &&
!methodCall.MethodInfo.DeclaringType.IsValueType
)
{
emitBox = true;
}
else if (
methodCall.Operand.Type.IsValueType && (
!(methodCall.Operand is FieldAccess) ||
methodCall.MethodInfo.DeclaringType.IsValueType
)
)
{
emitStoreLoad = true;
}
// Signal field access that we're using the field as a
// parameter.
_fieldAsParameter =
methodCall.Operand is FieldAccess &&
methodCall.MethodInfo.DeclaringType.IsValueType &&
!emitStoreLoad;
try
{
methodCall.Operand.Accept(this);
}
finally
{
_fieldAsParameter = false;
}
if (emitBox)
{
_il.Emit(OpCodes.Box, methodCall.Operand.Type);
}
else if (emitStoreLoad)
{
Debug.Assert(methodCall.Operand.Type == methodCall.MethodInfo.DeclaringType);
var builder = _il.DeclareLocal(methodCall.Operand.Type);
_il.Emit(OpCodes.Stloc, builder);
_il.Emit(OpCodes.Ldloca, builder);
}
}
var parameters = methodCall.MethodInfo.GetParameters();
var arguments = methodCall.Arguments;
bool paramsMethod =
parameters.Length > 0 &&
parameters[parameters.Length - 1].GetCustomAttributes(typeof(ParamArrayAttribute), true).Length == 1;
int mandatoryParameterCount =
paramsMethod
? parameters.Length - 1
: parameters.Length;
for (int i = 0; i < mandatoryParameterCount; i++)
{
Emit(arguments[i], parameters[i].ParameterType);
}
if (paramsMethod)
{
var paramsType = parameters[parameters.Length - 1].ParameterType;
var elementType = paramsType.GetElementType();
bool emitted = false;
// When the params argument is missing, a new array is issued.
if (arguments.Count == mandatoryParameterCount)
{
ILUtil.EmitEmptyArray(_il, elementType);
emitted = true;
}
else if (arguments.Count == mandatoryParameterCount + 1)
{
var lastArgument = arguments[arguments.Count - 1];
// Null arguments are passed blindly.
if (lastArgument is Constant constant && constant.Value == null)
{
ILUtil.EmitNull(_il);
emitted = true;
}
else
{
// So are array arguments that can be casted.
if (
lastArgument.Type.IsArray &&
TypeUtil.CanCastImplicitely(lastArgument.Type, paramsType, false)
)
{
Emit(lastArgument, paramsType);
emitted = true;
}
}
}
// If we didn't find a shortcut, emit the array with all
// arguments.
if (!emitted)
{
ILUtil.EmitArray(
_il,
elementType,
arguments.Count - mandatoryParameterCount,
p => Emit(arguments[mandatoryParameterCount + p], elementType)
);
}
}
public override IExpression Cast(Cast cast)
{
if (cast.CastType == CastType.Convert)
{
var constant = cast.Operand as Constant;
if (TypeUtil.CanCastImplicitely(
cast.Operand.Type,
cast.Type,
constant != null && constant.Value == null
))
{
return(new Cast(cast.Operand, cast.Type));
}
string methodName = null;
switch (Type.GetTypeCode(cast.Type))
{
case TypeCode.Boolean: methodName = "ToBoolean"; break;
case TypeCode.Byte: methodName = "ToByte"; break;
case TypeCode.Char: methodName = "ToChar"; break;
case TypeCode.DateTime: methodName = "ToDate"; break;
case TypeCode.Decimal: methodName = "ToDecimal"; break;
case TypeCode.Double: methodName = "ToDouble"; break;
case TypeCode.Int32: methodName = "ToInteger"; break;
case TypeCode.Int64: methodName = "ToLong"; break;
case TypeCode.SByte: methodName = "ToSByte"; break;
case TypeCode.Int16: methodName = "ToShort"; break;
case TypeCode.Single: methodName = "ToSingle"; break;
case TypeCode.String: methodName = "ToString"; break;
case TypeCode.UInt32: methodName = "ToUInteger"; break;
case TypeCode.UInt64: methodName = "ToULong"; break;
case TypeCode.UInt16: methodName = "ToUShort"; break;
}
if (methodName != null)
{
var method = _resolver.FindOperatorMethod(
methodName,
Array.Empty <Type>(),
null,
new[] { cast.Operand.Type }
);
Debug.Assert(method != null && method.ReturnType == cast.Type);
return(new MethodCall(
new TypeAccess(method.DeclaringType),
method,
new[]
{
cast.Operand
}
));
}
else
{
return(new Cast(cast.Operand, cast.Type));
}
}
return(base.Cast(cast));
}
public override IExpression BinaryExpression(BinaryExpression binaryExpression)
{
var left = binaryExpression.Left.Accept(this);
var right = binaryExpression.Right.Accept(this);
if (
(
binaryExpression.ExpressionType == ExpressionType.Add &&
(left.Type == typeof(string) || right.Type == typeof(string))
) ||
binaryExpression.ExpressionType == ExpressionType.Concat
)
{
return(_resolver.ResolveMethod(
new TypeAccess(typeof(string)),
"Concat",
FlattenConcatArguments(binaryExpression.Left, binaryExpression.Right)
));
}
else if (binaryExpression.ExpressionType == ExpressionType.Power)
{
return(_resolver.ResolveMethod(
new TypeAccess(typeof(Math)),
"Pow",
new[] { left, right }
));
}
else if (_resolver.DynamicExpression.Language == ExpressionLanguage.VisualBasic)
{
// Special handling for Visual Basic.
string methodName = null;
switch (binaryExpression.ExpressionType)
{
case ExpressionType.Compares: methodName = "CompareObjectEqual"; break;
case ExpressionType.NotCompares: methodName = "CompareObjectNotEqual"; break;
case ExpressionType.Greater: methodName = "CompareObjectGreater"; break;
case ExpressionType.GreaterOrEquals: methodName = "CompareObjectGreaterEqual"; break;
case ExpressionType.Less: methodName = "CompareObjectLess"; break;
case ExpressionType.LessOrEquals: methodName = "CompareObjectLessEqual"; break;
}
// Is this an operator for which we have a method?
if (methodName != null)
{
// Should we output a normal comparison anyway?
if (TypeUtil.IsConvertible(left.Type) && TypeUtil.IsConvertible(right.Type))
{
var expressionType = binaryExpression.ExpressionType;
// Coerce Compares/NotCompares to Equals/NotEquals.
if (expressionType == ExpressionType.Compares)
{
expressionType = ExpressionType.Equals;
}
else if (expressionType == ExpressionType.NotCompares)
{
expressionType = ExpressionType.NotEquals;
}
if (
left == binaryExpression.Left &&
right == binaryExpression.Right &&
expressionType == binaryExpression.ExpressionType
)
{
return(binaryExpression);
}
else
{
return(new BinaryExpression(left, right, expressionType, binaryExpression.Type, binaryExpression.CommonType));
}
}
else
{
var method = typeof(Operators).GetMethod(methodName);
Debug.Assert(method.ReturnType == typeof(object));
return(new Cast(
new MethodCall(
new TypeAccess(typeof(Operators)),
method,
new[]
{
left,
right,
new Constant(false)
}
),
typeof(bool)
));
}
}
}
if (left == binaryExpression.Left && right == binaryExpression.Right)
{
return(binaryExpression);
}
else
{
return(new BinaryExpression(left, right, binaryExpression.ExpressionType, binaryExpression.Type));
}
}
private void BinaryArithicExpression(BinaryExpression binaryExpression)
{
// Reference compares.
if (
!binaryExpression.Left.Type.IsValueType &&
!binaryExpression.Right.Type.IsValueType && (
binaryExpression.ExpressionType == ExpressionType.Equals ||
binaryExpression.ExpressionType == ExpressionType.NotEquals
)
)
{
binaryExpression.Left.Accept(this);
binaryExpression.Right.Accept(this);
_il.Emit(OpCodes.Ceq);
if (binaryExpression.ExpressionType == ExpressionType.NotEquals)
{
_il.Emit(OpCodes.Ldc_I4_0);
_il.Emit(OpCodes.Ceq);
}
return;
}
Emit(binaryExpression.Left, binaryExpression.CommonType);
Emit(binaryExpression.Right, binaryExpression.CommonType);
switch (binaryExpression.ExpressionType)
{
case ExpressionType.Equals:
case ExpressionType.NotEquals:
_il.Emit(OpCodes.Ceq);
if (binaryExpression.ExpressionType == ExpressionType.NotEquals)
{
_il.Emit(OpCodes.Ldc_I4_0);
_il.Emit(OpCodes.Ceq);
}
break;
case ExpressionType.Greater:
case ExpressionType.LessOrEquals:
if (TypeUtil.IsUnsigned(binaryExpression.CommonType))
{
_il.Emit(OpCodes.Cgt_Un);
}
else
{
_il.Emit(OpCodes.Cgt);
}
if (binaryExpression.ExpressionType == ExpressionType.LessOrEquals)
{
_il.Emit(OpCodes.Ldc_I4_0);
_il.Emit(OpCodes.Ceq);
}
break;
case ExpressionType.Less:
case ExpressionType.GreaterOrEquals:
if (TypeUtil.IsUnsigned(binaryExpression.CommonType))
{
_il.Emit(OpCodes.Clt_Un);
}
else
{
_il.Emit(OpCodes.Clt);
}
if (binaryExpression.ExpressionType == ExpressionType.GreaterOrEquals)
{
_il.Emit(OpCodes.Ldc_I4_0);
_il.Emit(OpCodes.Ceq);
}
break;
case ExpressionType.Add:
if (_compiler._resolver.Options.Checked && TypeUtil.IsInteger(binaryExpression.CommonType))
{
if (TypeUtil.IsUnsigned(binaryExpression.CommonType))
{
_il.Emit(OpCodes.Add_Ovf_Un);
}
else
{
_il.Emit(OpCodes.Add_Ovf);
}
}
else
{
_il.Emit(OpCodes.Add);
}
break;
case ExpressionType.Divide:
if (TypeUtil.IsUnsigned(binaryExpression.CommonType))
{
_il.Emit(OpCodes.Div_Un);
}
else
{
_il.Emit(OpCodes.Div);
}
break;
case ExpressionType.Multiply:
if (_compiler._resolver.Options.Checked && TypeUtil.IsInteger(binaryExpression.CommonType))
{
if (TypeUtil.IsUnsigned(binaryExpression.CommonType))
{
_il.Emit(OpCodes.Mul_Ovf_Un);
}
else
{
_il.Emit(OpCodes.Mul_Ovf);
}
}
else
{
_il.Emit(OpCodes.Mul);
}
break;
case ExpressionType.Subtract:
if (_compiler._resolver.Options.Checked && TypeUtil.IsInteger(binaryExpression.CommonType))
{
if (TypeUtil.IsUnsigned(binaryExpression.CommonType))
{
_il.Emit(OpCodes.Sub_Ovf_Un);
}
else
{
_il.Emit(OpCodes.Sub_Ovf);
}
}
else
{
_il.Emit(OpCodes.Sub);
}
break;
case ExpressionType.Modulo:
if (TypeUtil.IsUnsigned(binaryExpression.CommonType))
{
_il.Emit(OpCodes.Rem_Un);
}
else
{
_il.Emit(OpCodes.Rem);
}
break;
default:
throw new InvalidOperationException();
}
}
private bool IsAllowableImplicit(Type a, Type b)
{
return(TypeUtil.IsInteger(a) == TypeUtil.IsInteger(b));
}
private Type ResolveExpressionType(Type left, Type right, Type commonType, ExpressionType type)
{
Require.NotNull(left, "left");
Require.NotNull(right, "right");
// TODO: Implicit/explicit operators and operators for the expression type.
// Boolean operators.
switch (type)
{
case ExpressionType.And:
case ExpressionType.Or:
case ExpressionType.Xor:
case ExpressionType.AndBoth:
case ExpressionType.OrBoth:
if (TypeUtil.IsInteger(commonType))
{
return(commonType);
}
else if (left != typeof(bool) || right != typeof(bool))
{
throw new ExpressionsException("Invalid operand for expression type", ExpressionsExceptionType.TypeMismatch);
}
return(typeof(bool));
case ExpressionType.Greater:
case ExpressionType.GreaterOrEquals:
case ExpressionType.Less:
case ExpressionType.LessOrEquals:
if (
!(left.IsEnum || TypeUtil.IsNumeric(left)) ||
!(right.IsEnum || TypeUtil.IsNumeric(right))
)
{
throw new ExpressionsException("Invalid operand for expression type", ExpressionsExceptionType.TypeMismatch);
}
return(typeof(bool));
case ExpressionType.Equals:
case ExpressionType.NotEquals:
case ExpressionType.In:
case ExpressionType.LogicalAnd:
case ExpressionType.LogicalOr:
case ExpressionType.Compares:
case ExpressionType.NotCompares:
return(typeof(bool));
case ExpressionType.Add:
if (
!(left == typeof(string) || right == typeof(string)) &&
!(TypeUtil.IsNumeric(left) && TypeUtil.IsNumeric(right))
)
{
throw new ExpressionsException("Invalid operand for expression type", ExpressionsExceptionType.TypeMismatch);
}
return(commonType);
case ExpressionType.Subtract:
case ExpressionType.Multiply:
case ExpressionType.Divide:
case ExpressionType.Power:
if (!TypeUtil.IsNumeric(left) || !TypeUtil.IsNumeric(right))
{
throw new ExpressionsException("Invalid operand for expression type", ExpressionsExceptionType.TypeMismatch);
}
return(commonType);
default:
return(commonType);
}
}
private Type ResolveExpressionCommonType(Type left, Type right, bool allowStringConcat, bool allowBothImplicit, bool allowObjectCoercion)
{
Require.NotNull(left, "left");
Require.NotNull(right, "right");
// No casting required.
if (left == right)
{
return(left);
}
if (allowObjectCoercion)
{
if (left == typeof(object))
{
return(right);
}
if (right == typeof(object))
{
return(left);
}
}
// Special cast for adding strings.
if (allowStringConcat && (left == typeof(string) || right == typeof(string)))
{
return(typeof(string));
}
// Can we cast implicitly?
var leftTable = TypeUtil.GetImplicitCastingTable(left);
var rightTable = TypeUtil.GetImplicitCastingTable(right);
if (leftTable != null && rightTable != null)
{
// See whether one of the types appears in the other.
foreach (var leftType in leftTable)
{
if (leftType == right)
{
return(leftType);
}
}
foreach (var rightType in rightTable)
{
if (rightType == left)
{
return(rightType);
}
}
// Otherwise, find the first common type.
int lowest = int.MaxValue;
for (int i = 0; i < leftTable.Count; i++)
{
for (int j = 0; j < rightTable.Count; j++)
{
if (leftTable[i] == rightTable[j])
{
lowest = Math.Min(lowest, j);
}
}
}
if (lowest != int.MaxValue)
{
if (
allowBothImplicit ||
(IsAllowableImplicit(left, rightTable[lowest]) && IsAllowableImplicit(right, rightTable[lowest]))
)
{
return(rightTable[lowest]);
}
}
}
// We can't cast implicitly.
throw new ExpressionsException("Cannot resolve expression type", ExpressionsExceptionType.TypeMismatch);
}
public IExpression UnaryExpression(Ast.UnaryExpression unaryExpression)
{
var operand = unaryExpression.Operand.Accept(this);
string operatorName = null;
switch (unaryExpression.Type)
{
case ExpressionType.Plus: operatorName = "op_UnaryPlus"; break;
case ExpressionType.Minus: operatorName = "op_UnaryNegation"; break;
case ExpressionType.Not:
case ExpressionType.LogicalNot:
operatorName = "op_Negation"; break;
}
if (operatorName != null)
{
var method = _resolver.FindOperatorMethod(
operatorName,
new[] { operand.Type },
null,
new[] { operand.Type }
);
if (method != null)
{
return(new Expressions.MethodCall(
new TypeAccess(method.DeclaringType),
method,
new[]
{
operand
}
));
}
}
Type type;
switch (unaryExpression.Type)
{
case ExpressionType.Plus:
if (!TypeUtil.IsValidUnaryArgument(operand.Type))
{
throw new ExpressionsException("Operand of plus operation must be an integer type", ExpressionsExceptionType.TypeMismatch);
}
type = operand.Type;
break;
case ExpressionType.Group:
type = operand.Type;
break;
case ExpressionType.Minus:
if (!TypeUtil.IsValidUnaryArgument(operand.Type))
{
throw new ExpressionsException("Operand of minus operation must be an integer type", ExpressionsExceptionType.TypeMismatch);
}
// TODO: Make constants signed and handle minus on unsigned's.
type = operand.Type;
break;
case ExpressionType.LogicalNot:
if (operand.Type != typeof(bool))
{
throw new ExpressionsException("Operand of not operation must be a boolean type", ExpressionsExceptionType.TypeMismatch);
}
type = typeof(bool);
break;
case ExpressionType.BitwiseNot:
if (!TypeUtil.IsInteger(operand.Type))
{
throw new ExpressionsException(
"Cannot not bitwise not boolean types",
ExpressionsExceptionType.TypeMismatch
);
}
type = operand.Type;
break;
case ExpressionType.Not:
if (TypeUtil.IsInteger(operand.Type))
{
type = operand.Type;
}
else
{
if (operand.Type != typeof(bool))
{
throw new ExpressionsException("Operand of not operation must be a boolean type", ExpressionsExceptionType.TypeMismatch);
}
type = typeof(bool);
}
break;
default:
throw new InvalidOperationException();
}
return(new Expressions.UnaryExpression(operand, type, unaryExpression.Type));
}
public IExpression IdentifierAccess(IdentifierAccess identifierAccess)
{
// First try variables.
var identifiers = _resolver.DynamicExpression.ParseResult.Identifiers;
for (int i = 0; i < _resolver.IdentifierTypes.Length; i++)
{
if (
_resolver.IdentifierTypes[i] != null &&
_resolver.IdentifiersEqual(identifiers[i].Name, identifierAccess.Name)
)
{
return(VariableAccess(_resolver.IdentifierIndexes[i], _resolver.IdentifierTypes[i]));
}
}
// Next, we go through the owner type.
if (_resolver.OwnerType != null)
{
var result = Resolve(new VariableAccess(_resolver.OwnerType, 0), identifierAccess.Name);
if (result == null)
{
result = Resolve(new TypeAccess(_resolver.OwnerType), identifierAccess.Name);
}
if (result != null)
{
return(result);
}
}
// Next, imports. Namespaces have precedence.
foreach (var import in _resolver.Imports)
{
if (
import.Namespace != null &&
_resolver.IdentifiersEqual(import.Namespace, identifierAccess.Name)
)
{
if (import.Type != null)
{
return(new TypeAccess(import.Type));
}
else
{
return(new ImportAccess(import));
}
}
}
// Next, members of the imports.
foreach (var import in _resolver.Imports)
{
if (import.Namespace == null)
{
var result = Resolve(new TypeAccess(import.Type), identifierAccess.Name);
if (result != null)
{
return(result);
}
}
}
// Last, see whether the identifier is a built in type.
var type = TypeUtil.GetBuiltInType(identifierAccess.Name, _resolver.DynamicExpression.Language);
if (type != null)
{
return(new TypeAccess(type));
}
throw new ExpressionsException(
String.Format("Unresolved identifier '{0}'", identifierAccess.Name),
ExpressionsExceptionType.UndefinedName
);
}
public IExpression BinaryExpression(Ast.BinaryExpression binaryExpression)
{
// In expressions are converted to method calls.
if (binaryExpression.Type == ExpressionType.In)
{
return(BinaryInExpression(binaryExpression));
}
// We need to do this here and not in the conversion phase because
// we need the return type of the method to fully bind the tree.
var left = binaryExpression.Left.Accept(this);
var right = binaryExpression.Right.Accept(this);
string operatorName = null;
switch (binaryExpression.Type)
{
case ExpressionType.Add: operatorName = "op_Addition"; break;
case ExpressionType.Divide: operatorName = "op_Division"; break;
case ExpressionType.Multiply: operatorName = "op_Multiply"; break;
case ExpressionType.Subtract: operatorName = "op_Subtraction"; break;
case ExpressionType.Equals: operatorName = "op_Equality"; break;
case ExpressionType.NotEquals: operatorName = "op_Inequality"; break;
case ExpressionType.Greater: operatorName = "op_GreaterThan"; break;
case ExpressionType.GreaterOrEquals: operatorName = "op_GreaterThanOrEqual"; break;
case ExpressionType.Less: operatorName = "op_LessThan"; break;
case ExpressionType.LessOrEquals: operatorName = "op_LessThanOrEqual"; break;
case ExpressionType.ShiftLeft: operatorName = "op_LeftShift"; break;
case ExpressionType.ShiftRight: operatorName = "op_RightShift"; break;
case ExpressionType.Modulo: operatorName = "op_Modulus"; break;
case ExpressionType.LogicalAnd: operatorName = "op_LogicalAnd"; break;
case ExpressionType.AndBoth: operatorName = "op_LogicalAnd"; break;
case ExpressionType.LogicalOr: operatorName = "op_LogicalOr"; break;
case ExpressionType.OrBoth: operatorName = "op_LogicalOr"; break;
case ExpressionType.BitwiseAnd: operatorName = "op_BitwiseAnd"; break;
case ExpressionType.BitwiseOr: operatorName = "op_BitwiseOr"; break;
case ExpressionType.And:
if (left.Type == typeof(bool) && right.Type == typeof(bool))
{
operatorName = "op_LogicalAnd";
}
else
{
operatorName = "op_BitwiseAnd";
}
break;
case ExpressionType.Or:
if (left.Type == typeof(bool) && right.Type == typeof(bool))
{
operatorName = "op_LogicalOr";
}
else
{
operatorName = "op_BitwiseOr";
}
break;
case ExpressionType.Xor:
operatorName = "op_ExclusiveOr";
break;
}
if (operatorName != null)
{
var method = _resolver.FindOperatorMethod(
operatorName,
new[] { left.Type, right.Type },
null,
new[] { left.Type, right.Type },
new[] { left is Expressions.Constant && ((Expressions.Constant)left).Value == null, right is Expressions.Constant && ((Expressions.Constant)right).Value == null }
);
if (method != null)
{
return(new Expressions.MethodCall(
new TypeAccess(typeof(string)),
method,
new[]
{
left,
right
}
));
}
}
Type commonType;
switch (binaryExpression.Type)
{
case ExpressionType.ShiftLeft:
case ExpressionType.ShiftRight:
if (!TypeUtil.IsInteger(left.Type))
{
throw new ExpressionsException("Left operand of shift operations must be of an integer type", ExpressionsExceptionType.TypeMismatch);
}
if (right.Type != typeof(int) && right.Type != typeof(byte))
{
throw new ExpressionsException("Right operand of shift operations must be integer or byte type", ExpressionsExceptionType.TypeMismatch);
}
commonType = left.Type;
break;
case ExpressionType.Power:
commonType = typeof(double);
break;
case ExpressionType.Greater:
case ExpressionType.GreaterOrEquals:
case ExpressionType.Less:
case ExpressionType.LessOrEquals:
commonType = ResolveExpressionCommonType(left.Type, right.Type, false, true, false);
break;
case ExpressionType.Equals:
case ExpressionType.NotEquals:
case ExpressionType.Compares:
case ExpressionType.NotCompares:
if (left.Type.IsValueType != right.Type.IsValueType)
{
throw new ExpressionsException("Cannot resolve expression type", ExpressionsExceptionType.TypeMismatch);
}
commonType = ResolveExpressionCommonType(left.Type, right.Type, false, false, true);
break;
default:
commonType = ResolveExpressionCommonType(left.Type, right.Type, binaryExpression.Type == ExpressionType.Add, false, false);
break;
}
var type = ResolveExpressionType(left.Type, right.Type, commonType, binaryExpression.Type);
var expressionType = binaryExpression.Type;
if (type != typeof(bool))
{
if (expressionType == ExpressionType.AndBoth)
{
expressionType = ExpressionType.BitwiseAnd;
}
else if (expressionType == ExpressionType.OrBoth)
{
expressionType = ExpressionType.BitwiseOr;
}
}
return(new Expressions.BinaryExpression(left, right, expressionType, type, commonType));
}
internal MethodInfo FindOperatorMethod(string methodName, Type[] sourceTypes, Type returnType, Type[] parameterTypes, bool[] parametersNull)
{
var candidates = new List <MethodInfo>();
foreach (var sourceType in sourceTypes)
{
foreach (var method in sourceType.GetMethods(BindingFlags.Static | BindingFlags.Public))
{
if (method.Name != methodName)
{
continue;
}
var parameters = method.GetParameters();
if (parameters.Length != parameterTypes.Length)
{
continue;
}
bool match = true;
bool implicitMatch = true;
if (returnType != null)
{
match = returnType == method.ReturnType;
implicitMatch = TypeUtil.CanCastImplicitely(
method.ReturnType, returnType, false
);
}
for (int i = 0; i < parameterTypes.Length; i++)
{
if (parameters[i].ParameterType != parameterTypes[i])
{
match = false;
}
if (!TypeUtil.CanCastImplicitely(
parameterTypes[i],
parameters[i].ParameterType,
parametersNull != null && parametersNull[i]
))
{
implicitMatch = false;
}
}
if (match)
{
return(method);
}
if (implicitMatch)
{
candidates.Add(method);
}
}
}
return(candidates.Count == 1 ? candidates[0] : null);
}